Results 1 to 10 of about 45 (40)

Integrated acoustic identification of a petit-spot volcanic field in the oldest Pacific plate. [PDF]

Sci Rep
Petit-spot volcanism plays a critical role in the metasomatism of oceanic plates prior to subduction and in their recycling into the deep mantle. The extent of metasomatism depends on the number and volume of petit-spot volcanic edifices and intrusions ...
Machida S, Kaneko J, Inose K, Nozaki T, Iijima K, Hirano N.   +5 more
europepmc   +2 more sources

Air-Lift Pumping System for Hybrid Mining of Rare-Earth Elements-Rich Mud and Polymetallic Nodules around Minamitorishima Island

Journal of Marine Science and Engineering
REE-rich mud under the seabed at a 5500–5700 m water depth around Minamitorishima island and polymetallic nodules buried in the deep seabed are very promising and attractive to explore and develop.
Yasuhiro Kato, , Kato Yasuhiro
exaly   +3 more sources

Numerical Simulation on Hybrid Lifting Operation of Polymetallic Nodules and Rare-Earth Elements-Rich Mud by Air-Lift Pump in Deep Sea around Minamitorishima Island

Journal of Marine Science and Engineering
Polymetallic nodules and REE-rich mud under the seabed of 5500–5700 m water depth around Minamitorishima island are promising and attractive for exploration and development.
Koichiro Fujinaga, Yasuhiro Kato
exaly   +3 more sources

Hybrid Mining of Rare-Earth Elements-Rich Mud and Polymetallic Nodules by Air-Lift Pump in Deep Sea around Minamitorishima Island

Journal of MMIJ
REE-rich mud and polymetallic nodules located under the seabed at water depth of 5500–5700 m around Minamitorishima island are highly attractive for exploration and development, given the recent paradigm shift towards renewable energies based on green ...
Yasuhiro Kato, Yutaro Takaya
exaly   +3 more sources

Petrography and stratigraphic Os isotopic ages of ferromanganese nodules from the Northwest Pacific east of Minamitorishima Island

Journal of Asian Earth Sciences: X
The area offshore of Minamitorishima Island, Northwestern Pacific Ocean, contains large amounts of seafloor mineral resources such as ferromanganese (Fe–Mn) nodules, Fe–Mn crusts, and rare-earth element and yttrium (REY)-rich muds.
Tatsuo Nozaki, Teruaki Ishii
exaly   +3 more sources

Secular Variations in Provenance of Sedimentary Components in the Western North Pacific Ocean Constrained by Sr Isotopic Features of Deep‐Sea Sediments

Geochemistry, Geophysics, Geosystems, 2022
Deep‐sea sediments around Minamitorishima Island in the western North Pacific Ocean record the depositional environment in the central to western North Pacific since the late Cretaceous.
Erika Tanaka, Kazutaka Yasukawa, Kentaro Nakamura, Junichiro Ohta, Takashi Miyazaki, Bogdan Stefanov Vaglarov, Shiki Machida, Koichiro Fujinaga, Hikaru Iwamori, Yasuhiro Kato   +9 more
doaj   +1 more source

Magnetostratigraphic evidence for post-depositional distortion of osmium isotopic records in pelagic clay and its implications for mineral flux estimates

Earth, Planets and Space, 2021
Chemical stratigraphy is useful for dating deep-sea sediments, which sometimes lack radiometric or biostratigraphic constraints. Oxic pelagic clay contains Fe–Mn oxyhydroxides that can retain seawater 187Os/188Os values, and its age can be estimated by ...
Yoichi Usui, Toshitsugu Yamazaki
doaj   +1 more source

Evaluation of a new JMA aircraft flask sampling system and laboratory trace gas analysis system [PDF]

Atmospheric Measurement Techniques, 2013
We established and evaluated a flask air sampling system on a cargo C-130H aircraft, as well as a trace gas measurement system for the flask samples, as part of a new operational monitoring program of the Japan Meteorological Agency (JMA).
K. Tsuboi, H. Matsueda, Y. Sawa, Y. Niwa, M. Nakamura, D. Kuboike, K. Saito, H. Ohmori, S. Iwatsubo, H. Nishi, Y. Hanamiya, K. Tsuji, Y. Baba   +12 more
doaj   +1 more source

K-feldspar enrichment in the Pacific pelagic sediments before Miocene

Progress in Earth and Planetary Science, 2023
The mineralogy of atmospheric silicate dust controls its interaction with clouds. K-feldspar has a remarkably high ice-nucleating activity, and its distribution may have influenced the global climate throughout Earth's history.
Yoichi Usui, Toshitsugu Yamazaki
doaj   +1 more source

An Experimental Study of Pulp-Lift Characteristics Using a High-Viscous Fluid Simulating Deep Muddy Seawater

Journal of Marine Science and Engineering
Rare-earth mud and manganese nodules coexist on the seafloor around Minamitorishima Island. To investigate the feasibility of a pulp-lift system that can ensure economic efficiency by pumping manganese using rare-earth mud as the working fluid, we ...
Sakai Onishi, Yurie Itagaki, Naoki Nakatani, Kyara Ohara, Hiroyuki Katayama, Tetsuo Yamazaki   +5 more
doaj   +1 more source